I have a TreeWidget and i have managed to paint progress bar on one of column in QTreeWidget but i cannot get my head around painting combo box in (a different) column. Following is my QItemDelegate derived class:
Qt Code: 
  1. #include "listviewdelegate.h"
  2. #include "mainwindow.h"
  3.  
  4.  
  5.  
  6.       ListViewDelegate::ListViewDelegate(MainWindow *parent):QItemDelegate(parent) {}
  7.  
  8.  
  9.  
  10. void ListViewDelegate::paint(QPainter *painter,const QStyleOptionViewItem &option,const QModelIndex &index) const
  11.         {
  12.  
  13.     MainWindow* mw=static_cast<MainWindow*>(parent());
  14.  
  15.             if (index.column() == 7)    
  16.             {
  17.  
  18.              createEditor(mw,option,index);
  19.              //this prints at wrong place
  20.  
  21.                 return;
  22.             }
  23.             else if (index.column()==4) //progress
  24.             {
  25.                 QStyleOptionProgressBarV2 progressBarOption;
  26.                 progressBarOption.state=QStyle::State_Enabled;
  27.                 progressBarOption.direction = QApplication::layoutDirection();
  28.                 progressBarOption.rect = option.rect;
  29.                 progressBarOption.fontMetrics = QApplication::fontMetrics();
  30.                 progressBarOption.minimum = 0;
  31.  
  32.                 try{
  33.                     progressBarOption.maximum=mw->totalSize[index.row()];
  34.                 }
  35.                 catch(...){
  36.                 }
  37.  
  38.                 progressBarOption.textAlignment = Qt::AlignCenter;
  39.                 progressBarOption.textVisible = true;
  40.                 if (index.row() == mw->currIdx){
  41.  
  42.                     int progress=mw->progress;
  43.  
  44.                     try{
  45.                          progressBarOption.progress = progress < 0 ? 0 : progress;
  46.                     }
  47.                     catch(...){
  48.                     }
  49.  
  50.                     progressBarOption.text = CMFile::getShortValue(progressBarOption.progress)+" / " +CMFile::getShortValue(progressBarOption.maximum);
  51.                 }
  52.                 else
  53.                 {
  54.                     progressBarOption.text=(index.row() < mw->currIdx)?"Completed":"Queued";
  55.  
  56.                 }
  57.                 QApplication::style()->drawControl(QStyle::CE_ProgressBar,&progressBarOption,painter);
  58.                 return;
  59.  
  60.             }
  61.  
  62.  
  63.  
  64.              QItemDelegate::paint(painter,option,index);
  65.  
  66.              return;
  67.  
  68.  
  69.  
  70.  
  71.  
  72.     }
  73.  
  74. QWidget*  ListViewDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
  75. {
  76.     QComboBox *cmbBox=new QComboBox(parent);
  77.     cmbBox->insertItem(0,"YES");
  78.     cmbBox->insertItem(1,"NO");
  79.  
  80.  
  81.     cmbBox->setVisible(true);
  82.  
  83. return cmbBox;
  84. }
  85. void ListViewDelegate::setEditorData(QWidget *editor,
  86.                                     const QModelIndex &index) const
  87. {
  88.     int value = index.model()->data(index, Qt::EditRole).toInt();
  89.  
  90.     QComboBox *cmbBox = static_cast<QComboBox*>(editor);
  91.     cmbBox->setCurrentIndex(value);
  92. }
  93.  
  94. void ListViewDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
  95.                                    const QModelIndex &index) const
  96. {
  97.     QComboBox *cmbBox = static_cast<QComboBox*>(editor);
  98.  
  99.     int value = cmbBox->itemText(0).toInt();
  100.  
  101.     model->setData(index, value, Qt::EditRole);
  102. }
  103.  
  104. void ListViewDelegate::updateEditorGeometry(QWidget *editor,
  105.     const QStyleOptionViewItem &option, const QModelIndex &/* index */) const
  106. {
  107.     editor->setGeometry(option.rect);
  108. }
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It does paint the combobox but it does it at 0,0 location on form. when i have set geometry to option's rect object already.

any idea? thanks